Trim() function doesn't work

I have installed Visual Basic 6 (from Visual Studio) on my computer, and another things.
A have an application that works OK on another computer.
But this application doesn't work on the new computer: VB IDE doesn't recognize Trim() function. Why?
I suppose that VB6 isn't correct installed and I have no path to VB libraries. But what library has Trim() function?

Thanks,
I have done what you said, and I have got the following:
-In the form code, TRim function is now recognized
-But my project group has also an ActiveX DLL projects, and the trim function isn't recognized in the code of this dll. Why?

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